There will be plenty of change at Arsenal in the summer transfer window, but there are also key players who are likely to remain at the club but with plenty still to prove. Mikel Arteta and Arsenal sporting director Edu will be busy in the upcoming summer transfer window. As much as they will be keen to add to their squad, they must also make room for new arrivals by clearing the decks at the Emirates Stadium. A number of Arsenal players may leave the club this summer. However, there is a limit on how many players the Gunners will be able to offload. As such, a number of players will remain on…